如图,点C在以
为直径的
上,
平分
交
于点D,过D作
的垂线交
的延长线于点F,垂足为E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/19/44703010-b75f-4287-97aa-398e476fbab1.png?resizew=264)
(1)求证:
与
相切;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/19/44703010-b75f-4287-97aa-398e476fbab1.png?resizew=264)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
22-23九年级上·广东阳江·期末 查看更多[2]
更新时间:2022-12-28 14:49:02
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相似题推荐
解答题-证明题
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【推荐1】如图,在四边形
中,
.
,
,点E在边
上,连接
,
相交于点F,且
.
是等边三角形;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5198a1f7c985294297fbdf740f58babf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5447a70b9197de4d2814c227a33b42fc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73538c09794f3223540bfe074edff82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】(1)解方程组
(2)如图,矩形ABCD的对角线AC,BD相交于点O,若AB=AO,求∠ABD的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b65b9b011330781d6b2a2664cfb4363d.png)
(2)如图,矩形ABCD的对角线AC,BD相交于点O,若AB=AO,求∠ABD的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/e35b035a-ca2e-4198-a23c-2ba300bed63e.png?resizew=197)
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解答题-作图题
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【推荐1】如图,已知
,点
是
上的一个定点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/69f7e05a-2c52-450a-bdb6-c8ed0d73c2ae.png?resizew=169)
(1)请运用尺规在所给的图中按下列步骤完成作图,并按要求标上相应字母:
①作
的平分线和过点
作
的垂线,使它们交于点
;
②以点
为圆心,
长为半径作
;
(2)完成(1)的作图后,求证:
是
的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/69f7e05a-2c52-450a-bdb6-c8ed0d73c2ae.png?resizew=169)
(1)请运用尺规在所给的图中按下列步骤完成作图,并按要求标上相应字母:
①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
②以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)完成(1)的作图后,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解题方法
【推荐2】已知:如图,
为
的直径,
过
的中点
,
于点
.
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490289929322496/2492827729551360/STEM/444e447d-411e-428d-8466-449651b54e81.png)
(1)试判断直线
与
的位置关系,并说明理由;
(2)若
,
,求
的直径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490289929322496/2492827729551360/STEM/444e447d-411e-428d-8466-449651b54e81.png)
(1)试判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5490dba7da9a3f60c2f9440b2ddd0162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-作图题
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名校
【推荐3】下面是小美设计的“过圆上一点作圆的切线”的尺规作图过程.
已知:点A在
上.
求作:
的切线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/d3fb3902-3236-4cb2-884a-dc0edefaa71e.png?resizew=115)
作法: ①作射线
;
②以点A为圆心,适当长为半径作弧,交射线
于点C和点D;
③分别以点C,D为圆心,大于
长为半径作弧,两弧交点B;
④作直线
.
则直线
即为所求作的
的切线.
根据小美设计的尺规作图过程,解决下面的问题:
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:连接
,
.
由作图可知,
,
.
∴
.
∵ 点A在
上,
∴直线
是
的切线( ) (填写推理依据) .
已知:点A在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/d3fb3902-3236-4cb2-884a-dc0edefaa71e.png?resizew=115)
作法: ①作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②以点A为圆心,适当长为半径作弧,交射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
③分别以点C,D为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b840be5852709e18ea985954545e78d.png)
④作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
则直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
根据小美设计的尺规作图过程,解决下面的问题:
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
由作图可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
∵ 点A在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-问答题
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【推荐1】图1是一个虎口式夹子的俯视示意图,点O是夹子转轴,点O左边是两段相等的夹弧
与
(点A与点B重合),右边是长度相等的两部分夹柄,
于点E,
于点F,
,
.其中
,
.
(1)求
的长及图1中
的大小;
(2)按图2方式用手指按夹柄,夹子两边绕点O转动.当点C,D重合时,两段弧
与
恰好在同一圆上,求此时优弧
的长.(结果保留π)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1f667712f157100aa01a0917004abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f606bf7959544f92f299b27053041e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ce120737c3eea8ae7454fa4f56bad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6df5d332508f360ba73bc32b7b2f364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4d2c11bae882cb5a82c5df0383707a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a840c72c42be446251039a6726a8dee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbdf842a44196d0850995c164eec97e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e29e25c61b1813c0545227892235082.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/7d940147-de2f-4355-bacc-38d339219493.png?resizew=421)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
(2)按图2方式用手指按夹柄,夹子两边绕点O转动.当点C,D重合时,两段弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1f667712f157100aa01a0917004abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f606bf7959544f92f299b27053041e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c6b8d95b188074ae972314973d6b96.png)
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名校
【推荐2】如图,
为
上一点,点
是直径
延长线上的一点,连接
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/6261d2ac-4f1c-40a6-83c1-4f3fc54b85d3.png?resizew=173)
(1)求证:
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f37eb7f363ef89c743b86dfbf51231ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/6261d2ac-4f1c-40a6-83c1-4f3fc54b85d3.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49437f474e5805688dff21ded2d1fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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